On vacation, on the move, with the wife, trust IBIS or use a tripod?

We are going to Washington State, Vancouver, Victoria, up to Whistler, etc. We'll be driving here and there. Do I hand-hold the E-M1 (with grip on) or pull the tripod out of the back seat. Remember the scenario: on vacation, on the move, with the wife...Also, I am assuming SOP is to turn the IBIS off when you are on the tripod.